<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="addCategory">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        class="treeTable"
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-if="scope.row.cat_deleted === false"
            style="color:lightgreen;"
          ></i>
          <i class="el-icon-error" v-else style="color:red;"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope" style="width:250px;">
          <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 7, 10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialog" width="40%" @close="addCateDialogClosed">
      <el-form
        :model="addCateFrom"
        :rules="addCateFromRules"
        ref="addCartFromRef"
        class="addFrom"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateFrom.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <el-cascader
            expand-trigger="hover"
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChange"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialog = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //服务器请求条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      //保存获取的数据
      cateList: [],
      //保存数据的条数
      total: null,
      //table定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name"
        },
        {
          label: "是否有效",
          type: "template",
          template: "isok"
        },
        {
          label: "排序",
          //表示定义为模板
          type: "template",
          //模板名称
          template: "order"
        },
        {
          label: "操作",
          //表示定义为模板
          type: "template",
          //模板名称
          template: "opt"
        }
      ],
      //添加对话框是否显示
      addCateDialog: false,
      //添加分类数据绑定对象
      addCateFrom: {
        //要添加的名称
        cat_name: "",
        //要添加的id
        cat_pid: 0,
        //要添加的一级分类
        cat_level: 0
      },
      //添加分类校验对象
      addCateFromRules: {
        cat_name: [
          { required: true, message: "请输入角色名称", trigger: "blur" }
        ]
      },
      //保存父级父级分类
      parentCateList: [],
      //定义级联选择器配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children"
      },
      //选中的父级分类的id数组
      selectedKeys: []
    };
  },
  created() {
    this.getCateList();
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取数据失败！");
      }

      this.cateList = res.data.result;
      this.total = res.data.total;
    },
    //监听pagesize改变事件
    handleSizeChange(newSzie) {
      this.queryInfo.pagesize = newSzie;
      this.getCateList();
    },
    //监听pagenum改变
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getCateList();
    },
    //添加分类按钮点击
    addCategory() {
      this.getParentCateList();
      this.addCateDialog = true;
    },
    //获取父级分类
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 }
      });
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类失败！");
      }
      console.log(res.data);
      this.parentCateList = res.data;
    },
    //级联选择器触发事件
    parentCateChange() {
      if (this.selectedKeys.length > 0) {
        this.addCateFrom.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ];

        this.addCateFrom.cat_level = this.selectedKeys.length;
        return;
      } else {
        this.addCateFrom.cat_pid = 0;
        this.addCateFrom.cat_level = 0;
      }
      console.log(this.selectedKeys);
    },
    //监听对话框关闭事件
    addCateDialogClosed() {
      this.$refs.addCartFromRef.resetFields();
      this.selectedKeys = [];
      this.addCateFrom.cat_pid = 0;
      this.addCateFrom.cat_level = 0;
    },
    //点击添加新分类
    addCate() {
        this.$refs.addCartFromRef.validate(async valid => {
            if(!valid) return
            const {data: res} = await this.$http.post('categories',this.addCateFrom)
            if(res.meta.status !== 201 ) {
                return this.$message.error('添加失败！')
            }
            this.$message.success('添加成功！')
            this.getCateList()
            this.addCateDialog = false
        })
    }
  }
};
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.addFrom {
  .el-input {
    width: 75%;
    margin-left: 20px;
    height: 30px;
  }
  .el-cascader {
    width: 75%;
    margin-left: 20px;
    height: 30px;
  }
}
</style>